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Merge pull request #26 from Fenrur/master
Change some codes for to be Thread Safe
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103 changes: 103 additions & 0 deletions
103
src/main/java/com/jthemedetecor/util/ConcurrentHashSet.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| /* | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| package com.jthemedetecor.util; | ||
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| import java.util.Collection; | ||
| import java.util.Iterator; | ||
| import java.util.Map; | ||
| import java.util.Set; | ||
| import java.util.concurrent.ConcurrentHashMap; | ||
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| public class ConcurrentHashSet<E> implements Set<E> { | ||
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| private final Map<E, Object> map; | ||
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| private static final Object OBJ = new Object(); | ||
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| public ConcurrentHashSet() { | ||
| map = new ConcurrentHashMap<>(); | ||
| } | ||
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| @Override | ||
| public int size() { | ||
| return map.size(); | ||
| } | ||
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| @Override | ||
| public boolean isEmpty() { | ||
| return map.isEmpty(); | ||
| } | ||
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| @Override | ||
| public boolean contains(Object o) { | ||
| return map.containsKey(o); | ||
| } | ||
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| @Override | ||
| public Iterator<E> iterator() { | ||
| return map.keySet().iterator(); | ||
| } | ||
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| @Override | ||
| public Object[] toArray() { | ||
| return map.keySet().toArray(); | ||
| } | ||
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| @Override | ||
| public <T> T[] toArray(T[] a) { | ||
| return map.keySet().toArray(a); | ||
| } | ||
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| @Override | ||
| public boolean add(E e) { | ||
| return map.put(e, OBJ) == null; | ||
| } | ||
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| @Override | ||
| public boolean remove(Object o) { | ||
| return map.remove(o) != null; | ||
| } | ||
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| @Override | ||
| public boolean containsAll(Collection<?> c) { | ||
| return map.keySet().containsAll(c); | ||
| } | ||
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| @Override | ||
| public boolean addAll(Collection<? extends E> c) { | ||
| boolean changed = false; | ||
| for (E e: c) { | ||
| if (map.put(e, OBJ) == null) { | ||
| changed = true; | ||
| } | ||
| } | ||
| return changed; | ||
| } | ||
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| @Override | ||
| public boolean retainAll(Collection<?> c) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public boolean removeAll(Collection<?> c) { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
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| @Override | ||
| public void clear() { | ||
| map.clear(); | ||
| } | ||
| } |